﻿using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Windows.Data;
using ZOIL.DataModel;
using ZOIL.Library.Components;

namespace Sample.PhotoBrowser.Components
{
    [ValueConversion(typeof(Direction), typeof(ArrowEnds))]
    public class LinkDirectionConverter : IValueConverter
    {
        #region Implementation of IValueConverter

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || !(value is Direction))
                return ArrowEnds.None;

            var direction = (Direction)value;

            switch (direction)
            {
                case Direction.SourceToTarget:
                    return ArrowEnds.End;
                case Direction.TargetToSource:
                    return ArrowEnds.Start;
                case Direction.Both:
                    return ArrowEnds.Both;
            }
            return ArrowEnds.None;
        }

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value that is produced by the binding target.</param><param name="targetType">The type to convert to.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}
